    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Title</title>
        <style>
            .item {
                width: 200px;
                height: 200px;
                margin: 0;
                position: absolute;
                left: 300px;
                top: 200px;
                cursor: pointer;
                background-color: #00B0E7;
                -webkit-border-bottom-left-radius: 20px 500px;
                -webkit-border-bottom-right-radius: 500px 30px;
                -webkit-border-top-right-radius: 5px 100px;
                box-shadow: 0 2px 10px 1px rgba(0, 0, 0, 0.2);
                -webkit-box-shadow: 0 2px 10px 1px rgba(0, 0, 0, 0.2);
                -moz-box-shadow: 0 2px 10px 1px rgba(0, 0, 0, 0.2);
            }
        </style>
    </head>
    <body>
    <div id="container" >
        <div class="bigbox1">
            <div class="item">
                <p>我以我心向明月，奈何明月照沟渠</p>
                <a class="close">关闭</a>
            </div>
        </div>
    </div>
    </body>
    </html>